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124
…APPENDIX A – CONTROL TEMPLATES
L
LR
I/P1
Manual Output
OP1
Local Ratio
Remote Ratio
Process V
a
riable input
Wild V
a
riable
PV
WV
rAtO
Actual
Ratio
*
T
emplate 17 Only
*
Actual – Desired
Ratio
WV x
rAtO
+
bIAS
PV –
bIAS
WV
I/P3
I/P2
Profile
Set Point
A8
Ratio Station (Templates 16 and 17)
The
Ratio Station
provides a set point for a subsequent slave controller. The wild variable is weighted by ratio (
rAtO
) and bias (
bIAS
) values and
is then retransmitted as an analog output value. The ratio value applied to the wild variable can be either a local value set o
n the front panel or a remote
signal on an analog input.
The actual ratio of the process variable to the wild variable is also displayed.